U.S. Commerce Secretary Howard Lutnick has told ASML that Washington is concerned that one of its top chipmaking machines may have found its way to China in violation of U.S.-led export restrictions, Bloomberg News reported on Thursday. Lutnick expressed the concerns over ASML’s extreme ultraviolet lithography, or EUV machines, to senior leaders of the Dutch firm in a series of meetings, the report. ASML's most advanced EUV systems are roughly the size of a school bus and weigh 180 tons. The U.S. Commerce Department and the White House were not immediately available for comment outside business hours when contacted by...